Relief by-pass, and check valve



Jan. 7, 1930. E. c. BROWN ET AL 1,742,340

RELIEF, BY-PASS, AND CHECK VALVE Filed Jan. lO, 1929 4 H n www i!MMMHMHN VHHHHII V frm/wins `Patented Jan. 7, 1930 i myx@ igTzTE S "MP1,742,3iio

A'rsNr i ori-*ICE MxllDfIITA G. L'BRCJhTg OFNKENENETTfSQUARE ANDWILLIAME. HALE, OFFORTWASHING- TON, PENNSYLVANIA, ASSIGNGRS'TO AMERICANROAD MACHINERY COMPANY, OF i KENNETTSQUARE5-ABENNSY1LVANLA, AGORPORATEON OF DELAWARE ray-rees, AND CHECK i/*ALVE ""Aiipiiania'iiieJanuary io, 1929. seriai No. 331,413.

This invent-ion relates to arombiation ren i ticularly to 'al *valvedesigned 'foi-"controlling 1 1i`i"`order "i xovide a satis"factoryVrsurface tar or `oil from a taiilri'mounted'oiiatruclr or "wagointhe"spraying" being "done byinans of l; is heated." The iiioiin'tedjonfthecarrierl ant it isnecessfary to A "the oilf backlintel the tanlrieither"when the l i'naxin'iuni pressure is exceededor'undercer- 2o A l`desiredftofeithei shutioi Xor^"cut` down the iiowcftaifor p p p sivepressure .isfvery` apt to occiii",^becaiise of the smallnogZleffapert'urea` and consequently ajsuitable reliei'`valveisnecessary. Y `)FR-)reto'fore two' 'forms havebeeii "used, one

for manually by-'passing the 1 liquid "back to thefftanlrantli theother"'tor/bypassing the liquic'lwherithe"pressure"exc nded thepredeternined 'amount,' this llattei valveactiiig as "a safety greenerwaive; i

` tion topro'vide alcombined valve wliichacts baclwardiiow ofliquid.. f0th combination a as an autoniat-ic"` relief ,valve to bjypass the fluidt'tle taiilt in "case'oi excessive pressure and `which also `may bemanually" operable to "bypassftheliquid under thestated conditionsQiOPQF'eQH-z l lt is a furthe iibject to `p'iivide `in the above heckvalve `which will prevent relate-to details `of 'constru objects' "tion'whereby a simple" 'and 'satisfactory valve valve.

eifhai'idliiig ighly viscous 'substances ispro-` i duced.Thles'edbjectsand"their accomplish ment `will be apparent` from thefollowing i descriptiom i. x In the drawing Y Fig. 1 is a verticalsection `thifoi'igh the Fig; 2 is a vertical section taken atgrightanglestothe section shown in Fig. l.

The valve comprises a casing 2 `lha-ving 'an inlet passage 4 in thebottom thereof and an exit passage 6 in the side thereof It will be 1understood, however, as the descriptionproceeds, that these aperturesmay be otherwise placed while nevertheless retainingthe. advantages oftlieinvention.` A vertical bore in alignment with the intalreopening 4isi-deial, such asftar, is

fined bythe inneredges ot webs '8` which, asV disclosed, are four innumber and which provide vbetween theinpassages for liquid ienter ingtlie inlet and passingabout theinovable valve member 10, which is in theform of a iiston and arranged `to slide through the bore defined theinner edges offthe webs. l At the bottom of the webs the bore iscompletely cylindrical,` as shown in thetlgures atllQ,` so

that the valve pistonlO, `when iii this portion fof the bore, completelycloses thelin'let' A cylindrical ifalve seat lll` of brass' or thevlike, havinga bevelled upperedge,.is arranged to provide a seat for thevalve member 10' upon the entrance of valve 10in'to the portion 12 ofthe bore.

Arranged iii axial aligniientwith the bore 16. This stem is threaded 18throughout the lower portion of itsIength Land 0n"the end thereof isthreaded alfnut 20p adapted to act as a stopto prevent movementof' valveing slidably mounted on.` the 'stenrover the lower threaded portionthereot` In order to Y maintain valve member "10, in"` engagementwithiiut 520,` a spring 22 is provided" which at its lower end bearsagainst thevalve member and at its upper end reactsagainst adisclWliichis slidablyen` the stein and which is ber 10 and spring 22 andassociated parts, is movable as a unit to open the inlet, the stem beingmovable through the packing means at the upper portion o'f the casing.It will be observed that even though seat 14 is absent, the valve wouldclose the inlet, and it is sometimes desirable to eliminate this seat 14and consequently a stop 27 to limit inward movement of the stem isprovided.

The outward movement of stem 16 is limited by means of a cam groove 28in which the end of the stem rides, which groove is formed in a lever 30pivoted to the casing at 32, the cam groove 28 being eccentric withrespect to the pivotal center 32. Movement is imparted to lever 30through the medium of a link 34 connected at one end thereto and at itsother end to a lever 36 pivoted at 3S to the casing and provided with ahandle 4() which may be manually operated. An arcuate segment 42 securedto the casing is provided with a series of apertures 44 in any of whicha pin 46 may be placed to limit the downward movement of arm 40.

Assuming the parts to be in the position `shown in Fig. 1` the leasteccentric portion yond portion 12 of the bore so as to permit the escapeof fluid between webs 8 and through exit 6. Provision may be readilymade for by-passing of the fluid under various relief pressures bysubstituting different springs for spring 22, or by adjusting thetension of the spring by moving disc 24 y upwardly or downwardly andholding the same in position by nuts 26.

If it is desired to permit by-passing of the fluid, pin 46 may beremoved and handle depressed, the pin 46 being placed in suitableaperture 44. By such adjustment, a more eccentric portion of cam grooves28 is brought into alignment with the stem and consequently pressurebelow valve member 10 roduces a rise of the valve assembly a w ole,thereby permitting fluid to pass the valve member 10.

If at any time, while the valve member is o en, a reversal of pressureor flow occurs,

ne1ther the assembly or valve` member 10 will move downwardly intocontact with seat 14 or within portion 12 of the bore, thus pro-`ducinga check valve action to close inlet 4. That we claim and desire toprotect by Letters Patent is:

LA valve comprising a casing having a passage therein, a valve memberadapted to l close the passage to prevent flow ol fluid therethrough, acontrol member provided with a stop, said valve member being movablerelatively to the control member, means reacting between the controlmember and the valve member for yieldingly holding the valve memberagainst the stop, said control member being movable through the mediumof the said reacting means under fluid pressure exerted on the valvemember, and means for limiting such movement of the control member.

2. A valve comprising a casing having a passage therein, a valve memberadapted to close the passage to prevent flow of fluid therethrough, acontrol member provided with a stop, said valve member being movablerelatively to the control member, means reacting between the controlmember and the valve member for yieldingly holding the valve memberagainst the stop, said control member being movable through the mediumof the said reacting means under fluid pressure exerted on the valvemember, and means for limiting such movement of the control member, saidvalve member being movable independently of the control member to openthe passage under excessive pressure.

3. A valve comprising a casing having a passage therein, a valve memberadapted to close the passage to preventl flow of fluid therethrough, acontrol member provided with a stop, said valve member being movablerelatively to the control member, means reacting between the controlmember and the valve member for yieldingly holding the valve memberagainst the stop, said control member being movable through the mediumof the said reacting means under fluid pressure exerted on the valvemember, and means for limiting such movement of the control member, saidvalve member being free to close the passage independently of theposition of said movement limiting means.

4. A valve comprising a casing having a passage therein, a valve memberadapted to close the `passage to prevent flow of fluid therethrough, acontrol member provided with a stop, said valve member being movablerelatively to the control member, means reacting between the controlmember and the valve member for yieldingly holding the Valve memberagainst the stop, said control member being movable through the mediumof the said reacting means under fluid pressure exerted on the valvemember, and means for limiting such movement of the control member, saidvalve member being movable independently of the control member to openthe passage un'der excessive pressure, and being Vfree to close thepassage independently of the position of said movement limiting means.

5. A valve comprising a casing having a passage therein, a valve memberadapted to closethe passage to prevent flow of fluid therethrough, acontrol member provided with a stop, said valve member being movablerelatively to the control member, means reacting between the controlmember andthe valve member'for yieldingly holding the passage therein, avalve member adapted to close the passage to preVentfiOw of fluidtherethrough, a control member provided with a stop, said valve memberbeing movable relatively to the control member, means reacting betweenthe control member and the' valve member for yieldingly holding thevalve member against the stop, `said control member being movablethrough the medium of the said reacting means under fluid pressureexerted on the valve member, said con-V `trol member having a portionextending outside the casing, and adjustable means outside the casingfor limiting movement of the control member under fluid pressure actingto open the valve member.

7. A valve comprising a casing having a passage therein, a valve memberadapted to close the passage toprevent flow of fluid therethrough, astem slidablyV mounted in the casing, a stop carried by the stem, saidvalve member being movable relatively to the stem, a spring reactingbetween the stem and the valve member for yieldingly holding the valvemember against the stop, said stem "being movable through the medium ofthe spring under fluid pressure exerted on the valve member, and meansfor limiting,` such i movement of the stem. Y

8. A valve `comprising a casing having a passage therein, a valve memberadapted to close the vpassage to prevent flow of fluid therethrough, astem slidably mounted in the casing, a stop carried by the stem, saidvalve member being movablev relatively to the stem, a spring reactingbetween the stem and the valve member for yieldingly holding'the valvemember against the stop, said stem being movable through the medium of'the `spring under fluid pressure exerted on the valvemember, and meansfor limiting such movement of the stem, said valve member being movableindependently of the stem to open the passage under excessive pressure9. 'A valve com rising a casing havinO" a 'D b D passage therein, avalve member adapted to close the passage to prevent flow of fluidtherethrough, a stem slidably mounted in the j casing, a stop carried bythe stem, said valve member' being movable relatively to the stem,

` a spring reacting between the stem and the valve member forvyieldingly holding the valve member against the stop,said stem beingmovable through the medium of the spring underfluid pressure exertedonlthe ing movable Ythrough the medium of the spring under fluidpressure exerted on the valve member, and means for limiting suchmovement of the stem, said valve member being movable independently ofthe stem to open the passage under excessive pressure, and being free toclose the passage independently of the position of said movementlimiting means.

ll. A valve comprising acasing having a passage therein, a valve memberadapted to close the passage to prevent flow of fluid therethrough, astem slidably mounted in the casing, a stop carried by the stem,` saidvalve member being movable relatively to the stem, a spring reactingbetween the stem and the valve member for yieldingly holding the valvemember against the stop, said stem being movable through the medium ofthe springunder fluid pressure exerted on the valve member, and meansfor limiting such movement of the stem, said movement limiting meansbeing adjustable.

l2. A valve comprising a casing having a passagevtherein, a valve memberadapted to close the passage to prevent flow of fluid therethrough, alstemslidably mounted in the casing and projecting therethrough, a stopcarried by the stem within the casing, said valve member being movablerelatively-to the stem, a spring reacting between the stem and "thevalvemeinber for yieldingly holding the 22nd day of Oct-ober, 1928 and7th day of January, 1929, respectively.,

EDWIN C. BROWN. VILLIAM E. HALE.

